While Fabio reviews CCTV footage, audio clues of fast-forward or rewinding of classic audio-visual "tape" is heard. As these cameras are digital with no audio recording, no such sounds would exist when reviewing.
While in solitary confinement, Saray chastises Zulema through the air vent ostensibly at the base of a shared cinder block wall. Several times Saray taps, knocks, or leans up against the wall, which gives way slightly to reveal the wall is more likely a prop wall of thinner and flexible material painted and dressed to look like concrete.